Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ca51cc75e99efd8…

MALICIOUS

PDF

92.2 KB Created: 2021-07-16 07:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1082c20973e4fcd4d482260d1ec2d0ed SHA-1: 9ad5115bf3fdd5e08674ea8cf854c7242d4ac80b SHA-256: 1ca51cc75e99efd8cba34daea023e336b70a2c9c524d482ff8d10832dd19278b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains a link farm pointing to numerous URLs hosted on compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the nature of the link farm and the detection as a trojan imply a malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/lojorosaremok.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/v0sf0ki180dpust5en5d6pds8l/28643773136.pdf
    • https://nabsangram.com/userfiles/file/zixikoxonezawuvesoz.pdf
    • http://hkalc.com/userfiles/44104604545.pdf
    • http://scamps.biz/userfiles/file/70878213962.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0a330f598---jusofisoj.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/1a5935dfc98cbf22c9218cd2f28aa2aa/funaf.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/4781b184c64b5555679482381943a8ec/subuwadumuxigiba.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd977c83e6---salabumali.pdf
    • http://contextuae.com/resimler/files/lilavosakonufepekugopupe.pdf
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/vitavorigutubogamolumaxa.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/3651cab9a13e5f59fad11c9ff05f1b5b/11606344784.pdf
    • http://brukbet.com/user_images/file/19905519231.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d00b2b738fb---29688594308.pdf
    • http://branpc.in/ckfinder/userfiles/files/wosusifeder.pdf
    • https://propactionvehiclesuk.tv/userfiles/files/garebuwiduvemipabimajeko.pdf
    • http://christschoolblr.in/userfiles/file/39148450624.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50c9d9a267---80184916996.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606edbc2ad345---98067333062.pdf
    • http://vandientuchinhhang.com/upload/files/93780573919.pdf
    • https://nnkcreations.com/userfiles/file/74944183946.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d39c883ad04---sovofokomo.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7372893f1---kulaxuxatolimirasetekubar.pdf
    • http://kppzp.pl/userfiles/file/wadapitodapalu.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/sqk702ud4o6cdd4ld179db69nc/lawaguvezobonutapum.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983c7156bad---zewufipomebex.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=endergonic+and+exergonic+reactions+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010606.bin
f4d54d8b0c89c94d57237de271e2f815dd38b967fbb03188eb0fcbad7bfd6049
pdf-font-stream PDF embedded font (sfnt) at offset 0x10606 16944 bytes
font_01_sfnt_off00013278.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13278 16792 bytes
font_02_sfnt_off00014a8f.bin
c99a4e7cb291a86b9c050b5c50c826becbb60c2921320b790a8bd655652f32e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A8F 10832 bytes